CN-121994853-A - Method, device, medium and equipment for calculating shale oil layer pyrolysis parameters

CN121994853ACN 121994853 ACN121994853 ACN 121994853ACN-121994853-A

Abstract

The invention discloses a method, a device, a medium and equipment for calculating pyrolysis parameters of a shale oil layer. The method comprises the steps of transferring a sample to a laboratory by utilizing a liquid nitrogen freezing technology, carrying out pyrolysis analysis to obtain pyrolysis parameters S 1 , correcting the pyrolysis parameters S 1 obtained by the pyrolysis analysis to be oil retention, converting the oil retention to be oil containing volume, calibrating nuclear magnetic resonance T2 spectrum by utilizing the oil containing volume, determining the starting time of nuclear magnetic resonance logging to calculate the pyrolysis parameters S 1 , and continuously calculating the pyrolysis parameters S 1 according to the starting time of the pyrolysis parameters S 1 and the nuclear magnetic resonance logging T2 spectrum. According to the invention, the continuous calculation of S 1 is realized through the starting time of S 1 and the nuclear magnetic resonance logging T2 spectrum, the continuous quantitative characterization method for calculating S 1 by using the nuclear magnetic resonance logging is created, the continuous quantitative characterization of S 1 is realized, the influence of complex lithology on a logging curve is eliminated, the accuracy of the calculated result is greatly improved, and the accuracy completely meets the technical requirements of shale oil and gas exploration and development.

Inventors

ZHANG RONG
WANG ZHENLIN
WANG WEI
TANG FUKANG
LIU CAIGUANG
CHEN SHANHE
YU PEIRONG
YIN HE
LI YANGHU
FEI LIYING

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241107

Claims (8)

1. A method of calculating shale reservoir pyrolysis parameters, the method of calculating shale reservoir pyrolysis parameters comprising the steps of: S10, transferring a sample to a laboratory by utilizing a liquid nitrogen freezing technology, and performing pyrolysis analysis to obtain pyrolysis parameters S 1 ; S20, correcting the pyrolysis parameter S 1 obtained by pyrolysis analysis into the oil retention quantity; s30, converting the retained oil quantity into an oil-containing volume; S40, calibrating a nuclear magnetic resonance T2 spectrum by utilizing the oil-containing volume, and determining the calculation time of a nuclear magnetic resonance logging calculation pyrolysis parameter S 1 ; And S50, continuously calculating pyrolysis parameters S 1 according to the starting time of the pyrolysis parameters S 1 and the nuclear magnetic resonance logging T2 spectrum.
2. The method of calculating shale oil reservoir pyrolysis parameters of claim 1, wherein step S10 comprises the steps of: s110, after the core is taken out of the barrel, transferring the sample to a laboratory by utilizing a liquid nitrogen freezing technology; S120, preparing parallel samples in liquid nitrogen; s130, dividing the parallel sample into a sample 1 and a sample 2, performing pyrolysis analysis on the sample 1, and performing nuclear magnetic resonance T2 spectrum measurement on the sample 2; And S140, obtaining pyrolysis parameters S 1 and nuclear magnetic resonance T2 spectrum.
3. The method of calculating shale oil reservoir pyrolysis parameters as claimed in claim 1, wherein said step S20 comprises the steps of: S210, correcting the pyrolysis parameter S 1 obtained by the pyrolysis analysis to the retained oil amount based on the following formula: (1) Wherein W r is the residual oil quantity converted by S 1 , the unit mg/g is the pyrolysis parameter, the unit mg/g is S 1 , and C is the correction coefficient and represents the content coefficient of hydrocarbon in crude oil.
4. The method of calculating shale oil reservoir pyrolysis parameters as claimed in claim 1, wherein said step S30 comprises the steps of: S310 converting the retained oil amount into an oil-containing volume based on the following formula: (2) Wherein V o is the volume of oil converted by actually measured S 1 , W r is the residual oil quantity converted by S 1 , the unit is mg/g, and B is a correction coefficient.
5. The method of calculating shale oil reservoir pyrolysis parameters as claimed in claim 2, wherein said step S40 comprises the steps of: S410, determining the starting time of nuclear magnetic resonance logging calculation pyrolysis parameters S 1 based on the nuclear magnetic resonance T2 spectrum; s420, determining the starting time of the T2 value of S 1 when the mean square error is minimum by adopting the following formula: (3) (4) Wherein, the Calculating the oil content volume for the nuclear magnetism obtained when the starting time is a, and obtaining no dimension; Is the oil-containing volume component corresponding to the ith nuclear magnetism T2 time; The root mean square error is calculated as time a, V o is the measured oil content volume, dimensionless, and n is the number of samples.
6. An apparatus for calculating pyrolysis parameters of a shale oil reservoir, comprising: the pyrolysis module is used for transferring the sample to a laboratory by utilizing a liquid nitrogen freezing technology and carrying out pyrolysis analysis to obtain S 1 ; The correction module is used for correcting S 1 obtained by pyrolysis analysis into oil retention quantity; A conversion module for converting the retained oil volume to an oil-containing volume; The first calculation module is used for calibrating a nuclear magnetic resonance T2 spectrum by utilizing the oil-containing volume and determining the calculation time of nuclear magnetic resonance logging calculation S 1 ; and the second calculation module is used for realizing continuous calculation of S 1 according to the starting time of S 1 and the nuclear magnetic resonance logging T2 spectrum.
7. A computer readable storage medium comprising instructions which, when run on a computer, cause the computer to perform the method of calculating shale oil reservoir pyrolysis parameters of any one of claims 1 to 5.
8. A computing device, the computing device comprising: At least one processor, memory, and input output unit; Wherein the memory is for storing a computer program and the processor is for invoking the computer program stored in the memory to perform the method of calculating shale reservoir pyrolysis parameters of any one of claims 1-5.

Description

Method, device, medium and equipment for calculating shale oil layer pyrolysis parameters Technical Field The invention relates to the technical field of well logging evaluation, in particular to a method, a device, a medium and equipment for calculating pyrolysis parameters of a shale oil layer. Background Along with the deep exploration and development, shale oil gradually becomes a hot spot for exploration and development in recent years, and is an important component for guaranteeing national energy safety, but the shale oil exploration and development is still in a primary stage due to the fact that dessert identification difficulty is high, key parameter characterization precision is low, and development technology is imperfect. There is therefore a need to provide reliable and accurate evaluation parameters for shale oil dessert evaluation. Two localization parameters reflecting the amount of retained oil in shale oil are chloroform bitumen "a" and pyrolysis parameter S 1, respectively. Wherein the pyrolysis parameter S 1 is the content of liquid hydrocarbons stored in the rock sample that is vaporized by heating to 300 ℃ at a certain heating rate. Because the pyrolysis temperature is below 300 ℃, asphaltenes are substantially absent. The pyrolysis parameters S 1 are generally obtained by a pyrolysis experiment method at present. However, the loss of light hydrocarbon is large in the processes of coring, preserving and sample preparation, the physical property, the fluid property, the organic carbon content, the formation pressure, the environment temperature and the preserving time are different, the loss amount difference is large, the S 1 value obtained by the pyrolysis experiment method cannot be effectively recovered to the formation condition, and the accuracy of the calculation result is low. Disclosure of Invention The invention mainly aims to provide a method and a device for calculating pyrolysis parameters of a shale oil layer, which are used for solving the technical problem that pyrolysis parameters S 1 obtained in the prior art cannot be effectively recovered to stratum conditions, and the accuracy of calculation results is low. The method for calculating the pyrolysis parameters of the shale oil layer comprises the following steps of S10, transferring samples to a laboratory by utilizing a liquid nitrogen freezing technology, carrying out pyrolysis analysis to obtain pyrolysis parameters S 1, S20, correcting the pyrolysis parameters S 1 obtained by the pyrolysis analysis to be oil retention, S30, converting the oil retention to be oil content, S40, calibrating a nuclear magnetic resonance T2 spectrum by utilizing the oil content, determining the calculation time of the nuclear magnetic resonance logging calculation pyrolysis parameters S 1, and S50, and realizing continuous calculation of the pyrolysis parameters S 1 according to the calculation time of the pyrolysis parameters S 1 and the nuclear magnetic resonance logging T2 spectrum. Optionally, the step S10 comprises the steps of S110, transferring the sample to a laboratory by utilizing a liquid nitrogen freezing technology after the core is taken out of the barrel, S120, preparing parallel samples in liquid nitrogen, S130, dividing the parallel samples into a sample 1 and a sample 2, carrying out pyrolysis analysis on the sample 1, and carrying out nuclear magnetic resonance T2 spectrum measurement on the sample 2, and S140, obtaining pyrolysis parameters S 1 and nuclear magnetic resonance T2 spectrums. Optionally, the step S20 includes the step S210 of correcting the pyrolysis parameter S 1 obtained by the pyrolysis analysis to the oil retention amount based on the following formula: (1) Wherein W r is the residual oil quantity converted by S 1, the unit mg/g is the pyrolysis parameter, the unit mg/g is S 1, and C is the correction coefficient and represents the content coefficient of hydrocarbon in crude oil. Optionally, the step S30 includes the step S310 of converting the retained oil amount into an oil-containing volume based on the following formula: (2) Wherein V o is the volume of oil converted by actually measured S 1, W r is the residual oil quantity converted by S 1, the unit is mg/g, and B is a correction coefficient. Optionally, the step S40 includes the steps of S410, determining the starting time of the nuclear magnetic resonance logging calculation pyrolysis parameter S 1 based on the nuclear magnetic resonance T2 spectrum, and S420, determining the starting time of the T2 value with the minimum mean square error as S 1 by adopting the following formula: (3) (4) Wherein, the Calculating the oil content volume for the nuclear magnetism obtained when the starting time is a, and obtaining no dimension; Is the oil-containing volume component corresponding to the ith nuclear magnetism T2 time; The root mean square error is calculated as time a, V o is the measured oil content volume, dimensionless, and n is the numbe